JP2008207611A - Air-conditioning unit and vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioning unit and a vehicular air-conditioner capable of suppressing the noise of low frequency. <P>SOLUTION: There are provided a fan 9 for feeding air, a heat exchanger 7 for performing the heat exchange between the air fed to the fan 9 and itself, a first air passage 13 for leading the air fed from the fan 9 in the direction along a surface of the heat exchanger 7, and a second air passage 15 for bending the flow direction of the air passing through the first air passage 13 in the direction across the surface of the heat exchanger 7. Projection parts 25, 27 projected in the direction of the heat exchanger 7 and extending in the direction along the air flow in the first air passage 13 are provided on an opposing surface 19 opposite to the heat exchanger 7 in the second air passage 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioning unit and a vehicle air conditioning apparatus.

  In general, in an air conditioning unit such as a HVAC (Heating, Ventilation, and Air-Conditioning) unit used in a vehicle air conditioner, various noises are generated due to the disturbance of the airflow of air flowing inside the air conditioning unit. It is known to do.

  For example, noise generated by separation of airflow at a part of the air conditioning unit inside the wall where the wind speed is high, or noise generated by turbulence of the airflow generated due to the complicated structure of the part through which the air inside the air conditioning unit passes. Are known. In order to suppress the generation of such noise, a technique relating to a structure such as a wall surface that suppresses the generation of turbulent flow and reduces flow separation has been proposed (for example, see Patent Document 1).

On the other hand, there is also known noise generated when air flow is disturbed in a flow path that guides air to an evaporator inside the air conditioning unit. In order to suppress the generation of such noise, a technique related to the above-described structure in the flow path that makes the distribution of the air flow flowing into the evaporator uniform has also been proposed (see, for example, Patent Document 2).
JP 2006-151068 A Japanese Patent Laid-Open No. 2003-21936

  In addition to the noise described above, the noise is lower than the noise of the blade passing frequency (hereinafter referred to as 1NZ noise) determined based on the multiplication of the rotation speed (N) of the blower fan and the number of blades (Z) of the blower fan. It is known that noise having frequency components (hereinafter referred to as low frequency sound) is generated.

This low-frequency sound is generated by the backflow of air toward the inside of the blower fan generated in the vicinity of the tongue, the turbulence of the air flow in the diffuser that guides the air blown from the blower fan to the evaporator, and the airflow in the pre-evaporator There is a problem that it is difficult to suppress with the techniques described in Patent Documents 1 and 2 described above.
The frequency of the low frequency sound is not affected by the blower fan rotation speed (N).

  In particular, the technique described in Patent Document 2 can slightly reduce low-frequency sound, but has a problem that the pressure loss in the air flow flowing into the evaporator is large.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an air conditioning unit and a vehicle air conditioning apparatus that can suppress low-frequency sound.

In order to achieve the above object, the present invention provides the following means.
The air conditioning unit according to the present invention includes a fan that blows air, a heat exchanger that exchanges heat between the air blown to the fan, and the air blown from the fan along the surface of the heat exchanger. A first air passage that leads in a direction, and a second air passage that bends the direction of the flow of air that has passed through the first air passage in a direction that intersects the surface of the heat exchanger. And a protruding portion extending in a direction along the air flow in the first air passage is provided on the facing surface facing the heat exchanger in the first air passage. To do.

According to the present invention, since a part of the air flowing through the second air passage is guided by the projection, that is, the flow direction is restricted by the projection, the unstable air flow flowing through the second air passage can be reduced. it can.
By causing another part of the air flowing through the second air passage to collide with the protrusion, the direction of the flow can be changed from the facing surface toward the heat exchanger.

  In the above invention, it is desirable that a plurality of the protrusions are provided, and a flow passage area between the protrusions is substantially constant from the upstream side to the downstream side in the second air passage.

  According to the present invention, compared to the case where the flow passage area between the protrusions changes suddenly, the flow passage area is substantially constant, and the flow separation is less likely to occur when passing through the protrusion. It is possible to suppress an increase in pressure loss of the air flow flowing between the two.

  In the above invention, it is desirable that a plurality of the protrusions are provided, and a flow passage area between the protrusions decreases from the upstream side to the downstream side in the second air passage.

According to the present invention, the air flowing between the protrusions is pushed out from between the protrusions as the air flows from the upstream side toward the downstream side, and the direction changes in the direction from the facing surface toward the heat exchanger. Therefore, compared to the case where the flow path area between the protrusions is substantially constant, the amount of air flow whose direction changes in the direction from the facing surface toward the heat exchanger can be increased.

  In the above invention, it is preferable that a downstream surface in the second air passage between the protrusions is formed with a pressing surface that is inclined in a direction away from the facing surface toward the downstream side.

  According to the present invention, the direction of the flow of the air flowing between the protrusions is changed in a direction that collides with the pushing surface and leaves the facing surface. Therefore, compared with the case where the pushing surface is not provided, it is possible to increase the amount of air flow whose direction changes in the direction from the facing surface toward the heat exchanger.

  In the above invention, it is desirable that the protrusion is formed on at least one of the wall surfaces constituting the first air flow path.

  According to the present invention, part of the air flowing through the first air flow path flows between the protrusions, and the flow direction is restricted by the protrusions, so that unstable air flow in the first air flow path is reduced. Can be made.

  The vehicle air conditioner of the present invention is provided with the above-described air conditioner unit of the present invention.

  According to the present invention, since the air conditioning unit of the present invention is provided, low frequency sound can be suppressed.

  According to the air conditioning unit and the vehicle air conditioner of the present invention, a part of the air flowing through the air passage is caused to flow between the protrusions and the flow direction is restricted by the protrusions, whereby the air flowing through the second air passage is restricted. There is an effect that a stable air flow can be reduced and low frequency sound can be suppressed.

[First Embodiment]
Hereinafter, a vehicle air conditioner according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of an HVAC unit in the vehicle air conditioner according to the present embodiment.
As shown in FIG. 1, an HVAC (Heating, Ventilation, and Air-Conditioning) unit (air conditioning unit) 3 of the vehicle air conditioner 1 includes a casing 5, an evaporator (heat exchanger) 7, and a blower fan. (Fan) 9 is provided.

  The vehicle air conditioner 1 has a function of providing a comfortable vehicle interior environment by performing air conditioning and dehumidification by supplying conditioned air to the vehicle interior. The vehicle air conditioner 1 also includes a compressor (not shown) that is operated using a part of the output of the vehicle traveling internal combustion engine, and a condenser that condenses the gas refrigerant by exchanging heat with outdoor air. (Not shown), an expansion valve (not shown) that depressurizes the liquid refrigerant, and an evaporator 7 that exchanges heat with the introduced air to vaporize the liquid refrigerant, which are connected by a refrigerant pipe. Has a cycle. The above-described evaporator 7 has a function of removing vaporization heat from the introduced air, and the introduced air is used as a cooling means installed in the HVAC unit 3 together with a heater core (not shown) as a heating source for normal heating. It cools and dehumidifies.

The casing 5 stores the evaporator 7 and the blower fan 9 therein, and includes a fan casing 11 that stores the blower fan 9 and a diffuser (first air flow path) that guides air blown from the blower fan 9. 13 and a pre-evaporation air path (second air flow path) 15 that guides air to the evaporator 7.
The blower fan 9 is a fan that sucks air from the outside of the HVAC unit 3 and blows air toward the evaporator 7. For example, a sirocco fan is used.

  A blower fan 9 is rotatably disposed inside the fan casing 11, and air blown radially outward from the blower fan 9 is configured to flow along the cylindrical wall surface of the fan casing 11. . A diffuser 13 extending along the tangential direction of the cylindrical wall surface is connected to the fan casing 11. At the connecting portion between the diffuser 13 and the fan casing 11, a tongue portion 17 that protrudes in a convex shape toward the air flow path formed by the fan casing 11 and the diffuser 13 is formed.

  The diffuser 13 is a flow path that guides the air blown from the blower fan 9 to the pre-evaporating air path 15 and extends in a direction along the surface of the evaporator 7. In the present embodiment, description will be made by applying the case where the cross-sectional shape of the flow path of the diffuser 13 is substantially rectangular.

The pre-evaporator air passage 15 guides the air flowing in from the diffuser 13 to the evaporator 7, and the direction of the air flowing along the surface of the evaporator 7 in the diffuser 13 intersects the surface of the evaporator 7. (For example, in the vertical direction).
The evaporator 7 is disposed adjacent to the surface to which the diffuser 13 is connected in the pre-evaporator air path 15, and the flow path center line of the diffuser 13 and the surface of the evaporator 7 are disposed substantially parallel to each other. The facing surface 19 facing the evaporator 7 in the pre-evaporating air passage 15 is formed to be inclined so as to approach the evaporator 7 in a direction away from the connection surface of the diffuser 13.
Further, the pre-evacuation air passage 15 is configured by combining the first divided body 21 on the upstream side and the second divided body 23 on the downstream side.

FIG. 2 is a partially enlarged view for explaining the configuration of the pre-evacuation air passage of FIG. FIG. 3 is a partial cross-sectional view illustrating the cross-sectional shapes of the first protrusion and the second protrusion of FIG.
As shown in FIGS. 1 and 2, the opposing surface 19 in the first divided body 21 and the second divided body 23 protrudes toward the evaporator 7 side, and in the air flow direction (substantially left-right direction in FIG. 1). An extending first protrusion (protrusion) 25 and second protrusion (protrusion) 27 are provided.
As shown in FIG. 3, the first protrusion 25 and the second protrusion 27 are bowl-shaped formed by bending the facing surface 19 into a substantially triangular shape with a cross section pointed toward the evaporator 7 (upward in FIG. 3). Is a component of

As described above, the first protrusion 25 and the second protrusion 27 may have a substantially triangular cross section, or may be a cross section in which at least the vertex on the evaporator 7 side is a curved surface. Well, not particularly limited.
Further, as described above, the first protrusion 25 and the second protrusion 27 may be formed by bending, or the first protrusion 25 and the second protrusion 27 formed of a member different from the facing surface 19 may be formed. It may be arranged and is not particularly limited.
Furthermore, the heights (H) of the first protrusions 25 and the second protrusions 27 are not limited to be uniform in the direction in which the protrusions are arranged (the vertical direction of the HVAC unit 3).

FIG. 4 is a partial perspective view illustrating the configuration of the first protrusion of FIG.
As shown in FIG. 4, a rectifying unit 29 that suppresses an increase in loss due to an air flow collision is provided at the end of the first protrusion 25 on the air inflow side. The rectifying unit 29 is composed of a slope connecting the opposing surface 19 and the side surface of the first protrusion 25.
The height H1 of the first protrusion 25 from the facing surface 19 is the same value from the upstream end to the downstream end of the air flow. For this reason, the cross-sectional area of the first constraining flow path 31 that is the space between the first protrusions 25 is substantially constant from the upstream side to the downstream side of the air flow.
As shown in FIG. 2, the first protrusion 25 has an upstream end of the air flow disposed in the vicinity of the upstream end of the first divided body 21, and a downstream end of the first divided body 21. It is arrange | positioned away from the downstream edge part of 21. FIG.

FIG. 5 is a partial perspective view illustrating the configuration of the second protrusion of FIG.
As shown in FIG. 5, a rectifying unit 29 that suppresses an increase in loss due to an air flow collision and a flow separation is provided at the end of the second protrusion 27 on the air inflow side. The rectifying unit 29 is composed of a slope connecting the opposing surface 19 and the side surface of the second protrusion 27.
The height H21 from the opposing surface 19 at the upstream end of the air flow of the second protrusion 27 is formed to be lower than the height H22 at the downstream end. Therefore, the cross-sectional area of the second constraining flow path 33 that is the space between the second protrusions 27 becomes narrower from the upstream side to the downstream side of the air flow.
At the downstream end portion of the air flow in the second restricting flow path 33, a pushing surface 35 that is inclined from the facing surface 19 toward the evaporator 7 side (upward in FIG. 4) is provided toward the downstream side.
As shown in FIG. 2, the second projecting portion 27 is arranged such that the upstream end portion of the air flow is disposed downstream of the upstream end portion of the second divided body 23, and the downstream end portion is the second divided portion. It arrange | positions to the downstream end part of the body 23. FIG.

  The connection between the first protrusion 25 and the rectification unit 29 and the connection between the second protrusion 27 and the rectification unit 29 may be configured as a ridge line formed by connection between a plane and a plane. You may comprise as the curved surface connected smoothly to the projection part 25 or the 2nd projection part 27, It does not specifically limit.

Next, the air flow in the HVAC unit 3 of the vehicle air conditioner 1 having the above-described configuration will be described.
As shown in FIG. 1, when the blower fan 9 is rotationally driven, air is sucked from the outside of the HVAC unit 3 and is blown outward in the radial direction of the blower fan 9. The air blown by the blower fan 9 flows clockwise along the wall surface of the fan casing 11 and flows into the diffuser 13.
At this time, a part of the air flow collides with the tongue portion 17 to form a high-pressure region in a region near the tongue portion 17.

The air that has flowed into the diffuser 13 flows in a direction along the surface of the evaporator 7, and flows into the first divided body 21 of the pre-evaporator air passage 15.
As shown in FIGS. 2 and 4, a part of the air flowing into the first divided body 21 flows into the first constraining flow path 31 and is constrained by the first projecting portion 25, and then the second divided body 23. It flows toward. On the other hand, the other part of the air that has flowed in flows along the rectifying unit 29 of the first protrusion 25, thereby changing the direction of the flow toward the evaporator 7. The remaining air that has flowed in is divided into one that flows inside the first divided body 21 toward the second divided body 23 and one that flows into the evaporator 7.
in this way. By making the rectification part 29 into a slope, the flow flows into the rectification part 29 and the separation of the flow when colliding is suppressed.

  The air that has flowed into the second divided body 23 from the first divided body 21 flows into the second constraining flow path 33 and is restrained by the second protrusion 27 in the downstream side, as shown in FIGS. It flows toward. Since the flow path area of the second constraining channel 33 becomes narrower toward the downstream side, the air flowing through the second constraining channel 33 is pushed out of the second constraining channel 33 toward the evaporator 7 as it flows downstream. The direction of the flow is changed to the direction. Furthermore, the air that has flowed to the downstream end of the second restraint flow path 33 collides with the pushing surface 35 and flows along the pushing surface 35, and the flow direction is changed in the direction toward the evaporator 7.

On the other hand, the air that has flowed into the second divided body 23 flows into the evaporator 7 while flowing along the rectifying portion 29 of the second projecting portion 27 so that the direction of the flow is changed to the direction toward the evaporator 7.
In addition, the 2nd projection part 27 has the effect | action which directs the flow of air to the evaporator 7, and equalizes the wind speed distribution which passes the evaporator 7 as much as possible. The same applies to the first protrusion 25 of the first divided body 21.

  According to the above configuration, a part of the air flowing through the pre-evacuation air passage 15 flows through the first constraining channel 31 between the first protrusions 25 or the second constraining channel 33 between the second protrusions 27. The flow direction is restricted by the first protrusion 25 or the second protrusion 27. Therefore, the unstable air flow that flows through the pre-evacuation air passage 15 can be reduced, and low-frequency sound in the vehicle air conditioner 1 and the HVAC unit 3 can be suppressed.

  By causing the air flowing through the pre-evaporator air path 15 to follow the first protrusion 25 or the second protrusion 27, the flow direction can be changed in the direction from the facing surface 19 toward the evaporator 7. Therefore, the flow velocity distribution of the air flowing into the evaporator 7 can be made uniform.

  Since the flow area of the first constraining flow path 31 is substantially constant from the upstream side to the downstream side of the air flow, it flows through the first constraining flow path 31 compared to the case where the flow path area decreases. An increase in the pressure loss of the air flow can be suppressed.

  Since the flow area of the second restraint flow path 33 decreases from the upstream side to the downstream side of the air flow, the flow path area is directed from the facing surface 19 to the evaporator 7 as compared with the case where the flow area is substantially constant. The amount of air flow that changes direction can be increased. Therefore, the flow velocity distribution of the air flowing into the evaporator 7 can be made uniform.

The air that has flowed to the downstream end of the second restricting flow path 33 collides with the pushing surface 35 and the direction of the flow is changed in a direction away from the facing surface 19. Therefore, compared with the case where the pushing surface 35 is not provided, the flow direction can be forced in the direction from the facing surface 19 toward the evaporator 7, and the turbulence of the flow can be reduced.
In particular, it is possible to reduce the amount of air reaching the surface of the downstream end portion of the second divided body 23 (the surface extending in the vertical direction at the left end in FIG. 2) and to make the flow velocity distribution of the air flowing into the evaporator 7 uniform. it can.

  Since the first protrusion 25 and the second protrusion 27 are formed on the facing surface 19, the rigidity of the facing surface 19, that is, the pre-evacuation air passage 15 can be improved.

  By separating the downstream end of the first protrusion 25 from the end of the first divided body 21 and separating the upstream end of the second protrusion 27 from the end of the second divided body 23, The connection surface (split surface) between the body 21 and the second divided body 23 can be a flat surface, and the productivity of the HVAC unit 3 can be improved. Moreover, the sealing performance fall between the 1st division body 21 and the 2nd division body 23 can be prevented.

FIG. 6 is a cross-sectional view for explaining the arrangement of the first and second protrusions in FIG.
As shown in FIG. 6, the second protrusion 27 may be disposed on the downstream side of the first protrusion 25 as viewed from the upstream side of the air flow, or as indicated by the dotted line in FIG. 6. The first constraining flow path 31 may be disposed on the downstream side, and is not particularly limited.

  In the above-described embodiment, the first protrusion 25 and the second protrusion 27 are described as being applied to the front air passage 15, but the first protrusion is not provided on the wall surface of the diffuser 13. 25 may be provided along the flow of air. The wall surface of the diffuser 13 provided with the first protrusions 25 is not particularly limited, and may be one wall surface or all wall surfaces, and is not particularly limited.

  With such a configuration, part of the air flowing through the diffuser 13 flows through the first constraining flow path 31 between the first protrusions 25, so that unstable air flow in the diffuser 13 can be reduced. . Therefore, it is possible to suppress low frequency sound in the vehicle air conditioner 1 and the HVAC unit 3.

  When the pre-evacuation air passage 15 is integrally formed without being divided into the first divided body 21 and the second divided body 23 as described above, the first projecting portion is formed on the entire opposing surface 19. 25 or the second protrusion 27 may be provided, and is not particularly limited.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the vehicle air conditioner of the present embodiment is the same as that of the first embodiment, but the configuration of the first protrusion is different from that of the first embodiment. Therefore, in the present embodiment, only the configuration of the first protrusion is described with reference to FIGS. 7 and 8, and the description of other components and the like is omitted.
FIG. 7 is a partially enlarged view for explaining the configuration of the pre-evacuation air path in the HVAC unit of the vehicle air conditioner of the present embodiment. FIG. 8 is a perspective view illustrating the configuration of the first protrusion in FIG.
In addition, about the component same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The pre-evacuation air passage 15 in the HVAC unit 3 of the vehicle air conditioner 1 is provided with a first divided body 21 and a second divided body 23, and the opposing surface 19 of the first divided body 21 is shown in FIGS. As shown in FIG. 8, there is provided a third protrusion (protrusion) 41 that protrudes toward the evaporator 7 and extends in the air flow direction (substantially left-right direction in FIG. 7).
The third protrusion 41 is a bowl-shaped component formed by bending the opposing surface 19 into a substantially triangular shape with a cross section sharpened toward the evaporator 7, as with the first protrusion 25 and the second protrusion 27. is there.

As shown in FIG. 8, a rectifying unit 29 that suppresses an increase in loss due to air flow collision and flow separation is provided at the end of the third protrusion 41 on the air inflow side. The rectifying unit 29 is composed of a slope connecting the opposing surface 19 and the side surface of the third protrusion 41.
The height H31 from the facing surface 19 at the upstream end of the air flow of the third protrusion 41 is formed to be lower than the height H32 at the downstream end. Therefore, the cross-sectional area of the third constraining flow path 43 that is the space between the third protrusions 41 becomes narrower from the upstream side to the downstream side of the air flow.
As shown in FIG. 7, the third protrusion 41 has an upstream end of the air flow disposed in the vicinity of the upstream end of the first divided body 21, and a downstream end of the first divided body 21. It is arrange | positioned away from the downstream edge part of 21. FIG.

Next, the air flow in the HVAC unit 3 of the vehicle air conditioner 1 having the above configuration will be described.
Since the air flow until the air is introduced into the HVAC unit 3 and guided to the pre-evacuation air passage 15 is the same as in the first embodiment, the description thereof is omitted.

  As shown in FIGS. 7 and 8, a part of the air that has flowed into the first divided body 21 of the pre-evacuation air passage 15 flows into the third restraint flow path 43 and is restrained by the third protrusion 41. It flows toward the downstream side. Since the flow path area of the third constraining channel 43 becomes narrower toward the downstream side, the air flowing through the third constraining channel 43 is pushed out of the third constraining channel 43 as it flows downstream, and travels toward the evaporator 7. The direction of the flow is changed to the direction.

On the other hand, the other part of the air that has flowed in flows along the rectifying unit 29 of the third protrusion 41, so that the direction of the flow is changed to the direction toward the evaporator 7. The remaining air that has flowed in is divided into one that flows inside the first divided body 21 toward the second divided body 23 and one that flows into the evaporator 7.
Since the subsequent air flow in the second divided body 23 is the same as that in the first embodiment, a description thereof will be omitted.

According to said structure, the air which flows through the 3rd constrained flow path 43 between the 3rd protrusion parts 41 is pushed out from the 3rd constrained flow path 43 as it flows toward the downstream from the upstream, and the opposing surface 19 The direction changes in the direction from the to the evaporator 7. Therefore, the amount of air flow whose direction changes in the direction toward the evaporator 7 can be increased as compared with the case where the flow path area is substantially constant, and flows into the evaporator 7 as compared with the first embodiment. The air flow rate distribution can be made more uniform.
Furthermore, the height (H) of the third protrusion 41 is not limited to be uniform in the direction in which the protrusion is disposed (the vertical direction of the HVAC unit 3).

  In the above-described embodiment, the third projecting portion 41 and the second projecting portion 27 are applied to the example provided in the pre-evacuation air passage 15. However, the third projecting portion is formed on the wall surface of the diffuser 13. 41 may be provided along the flow of air. The wall surface of the diffuser 13 provided with the third protrusion 41 is not particularly limited, and may be one wall surface or all wall surfaces, and is not particularly limited.

  With such a configuration, a part of the air flowing through the diffuser 13 flows through the third constraining flow path 43 between the third protrusions 41, so that unstable air flow in the diffuser 13 can be reduced. . Therefore, it is possible to suppress low frequency sound in the vehicle air conditioner 1 and the HVAC unit 3.

  In addition, when the pre-evacuation wind path 15 is integrally formed without being divided into the first divided body 21 and the second divided body 23 as described above, the third restraint flow is formed on the entire facing surface 19. The path 43 may be provided and is not particularly limited.

It is sectional drawing explaining the schematic structure of the HVAC unit in the air conditioning apparatus for vehicles concerning the 1st Embodiment of this invention. It is the elements on larger scale explaining the structure of the pre-eva air path of FIG. It is a fragmentary sectional view explaining the cross-sectional shape of the 1st projection part of FIG. 2, and a 2nd projection part. It is a fragmentary perspective view explaining the structure of the 1st projection part of FIG. It is a fragmentary perspective view explaining the structure of the 2nd projection part of FIG. It is sectional drawing explaining the structure of arrangement | positioning in the 1st projection part of FIG. 2, and a 2nd projection part. It is the elements on larger scale explaining the structure of the pre-evaporation air path in the HVAC unit of the vehicle air conditioner of the 2nd Embodiment of this invention. It is a perspective view explaining the structure of the 1st projection part of FIG.

Explanation of symbols

1 Air conditioner for vehicles 3 HVAC unit (air conditioning unit)
7 Evaporator (heat exchanger)
9 Blower Fan (Fan)
13 Diffuser (first air flow path)
15 Eve front air passage (second air passage)
19 Opposing surface 25 First protrusion (protrusion)
27 Second protrusion (protrusion)
35 Pushing surface 41 Third protrusion (protrusion)

Claims (6)

A fan that blows air;
A heat exchanger for exchanging heat with the air blown to the fan;
A first air passage for guiding the air blown from the fan in a direction along the surface of the heat exchanger;
A second air passage that bends the direction of the flow of air that has passed through the first air passage in a direction that intersects the surface of the heat exchanger;
The opposing surface of the second air passage facing the heat exchanger is provided with a protrusion that protrudes in the direction of the heat exchanger and extends in the direction along the air flow in the first air passage. An air conditioning unit characterized by A plurality of the protrusions are provided,
2. The air conditioning unit according to claim 1, wherein a flow path area between the protrusions is substantially constant from an upstream side to a downstream side in the second air passage. A plurality of the protrusions are provided,
2. The air conditioning unit according to claim 1, wherein a flow path area between the protrusions decreases from an upstream side to a downstream side in the second air passage.   4. The pushing surface that is inclined in a direction away from the facing surface toward the downstream side is formed in a downstream region of the second air passage between the protrusions. 5. The air conditioning unit according to any one of the above.   5. The air conditioning unit according to claim 1, wherein the protrusion is formed on at least one of the wall surfaces constituting the first air flow path.   An air conditioning apparatus for a vehicle, comprising the air conditioning unit according to any one of claims 1 to 5.

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